JPH06123791A - Surveillance device for reactor control rod withdrawal and indicator for neutron detector status used for it - Google Patents

Abstract

PURPOSE:To provide a surveillance device for reactor control rod withdrawal providing a proper surveillance screen for control rod withdrawal by the output of neutron detectors arranged in the reactor and an indicator for neutron detector status used for the device. CONSTITUTION:The outputs of neutron instrumentation devices 31 to 3N measuring the outputs of neutron detectors 2Am, 2Bm, 2Cm, 2Dm placed dispersedly in three dimensions in a reactor 1 are input in a neutron detector status indicator 6 together with the output from a control rod controller 8 and a control rod withdrawal surveillance device 7. This neutron detector status indicator 6 has a graphics administration information and color administration information and is constituted of an indicator 63 consisting of a calculator 61 and CRT, etc., editing the indication screen basing on the input information, an indication control device 62 and a screen selection switch 64. The indication output for control rod withdrawal surveillance or the output status and operation status of the neutron detector are visually indicated on a display with the colors corresponding to output level according to a color administration table.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control rod withdrawal monitoring device in a nuclear power plant supervisory control system, and further, it is used for such control rod withdrawal monitoring to check the output of the neutron detector and the state of the neutron detector. The present invention relates to a neutron detector state display device suitable for displaying.

[0002]

2. Description of the Related Art Conventionally, a large number of neutron detectors are installed in a nuclear reactor, and the neutron flux in the nuclear reactor is measured by a nuclear instrumentation device.
Using the reactor power level and reactor power distribution on the central control panel display and outputting to the process computer
For example, Journal of Japan Atomic Energy Society, Vol. 27, No. 4,
P325-P329,1985, Akira Sekiguchi, et al.

In addition, the status of plants such as nuclear reactors and turbines, process trends, detailed process quantities, and various statuses of individual equipment are displayed on a color CRT of a supervisory control system in a summary display, trend display, digital display, Displaying by color-based symbolic display is described in, for example, Hitachi Review, Vol. 70, No. 4, P17 ~ P2
2, 1988-4. As an example of such a display according to the related art, as shown in, for example, FIG. 14 attached heretofore, the control rod map and the output for the control rod pull-out monitoring (RBM) of the peripheral region of the selected control rod are the same CR.
It was displayed on T.

Further, according to Japanese Patent Application Laid-Open No. 51-104195, no specific display method is shown, but an output distribution is obtained from the neutron flux distribution in the reactor and displayed. Is proposed. Further, Japanese Patent Laid-Open No. 3-165299 proposes a two-dimensional display in which the output distribution of a nuclear reactor is color-coded into a plurality of levels according to the output.

Further, regarding the measurement of the radiation intensity emitted from a predetermined object or region and displaying the radiation information for each small section in a color or shade corresponding to the intensity level, for example, Japanese Patent Application Laid-Open No. Sho 59-5498
No. 5, etc., has been publicly known.

[0006]

However, in the above-mentioned prior art, although it is known to display the neutron flux distribution by a color distribution or the like in order to monitor the power distribution in the reactor, Specifically, the use of the output of the neutron detector for monitoring the control rod withdrawal is not considered, and it is even more obvious to the operator when monitoring the output of the neutron detector for monitoring the control rod withdrawal. No consideration has been given to providing easy-to-use information and providing a more suitable display for the operator to make appropriate judgments and operations.

Further, in the above-mentioned prior art, in the nuclear reactor monitoring and control system, the display of the output of the neutron detector and the operating state of the neutron detector (for example, the bypass state), which is easy for the operator to understand, is also taken into consideration. There wasn't.

That is, in the above-mentioned prior art, no concrete display screen as a man-machine interface is shown for the output and operating state of the neutron detector, and for application in the reactor monitoring and control system. Was hardly considered.

In particular, in a nuclear reactor supervisory control system for controlling the output of a nuclear reactor by simultaneously pulling out or inserting a plurality of control rods, the positional relationship between the control rods and the neutron detector in the nuclear reactor, and It is extremely important for operators to make accurate judgments and operations to provide output information for monitoring the control rod withdrawal in the peripheral area of a plurality of selected control rods in an instant and easy-to-understand manner. It is very important for reliable operation in.

In addition, it is very important in terms of maintenance management of the neutron detector and operation management of the reactor that the operation state and bypass state of the neutron detector are aggregated and provided as a more readable man-machine interface. is there.

That is, it is necessary for the operator to process the information necessary for the operator's operation of the nuclear power plant into a more understandable form and to provide a more suitable man-machine interface for the operator to make an accurate judgment and operation. It is important for more reliable operation.

Therefore, the present invention has been made in view of the above problems in the prior art, and an object of the present invention is to perform control rod withdrawal monitoring based on the output of the neutron detector arranged in the reactor. It is an object of the present invention to provide a control rod pull-out monitoring device and a neutron detector status display device for a reactor capable of displaying an output suitable for monitoring.

Another object of the present invention is to provide a man-machine interface which is used in the control rod pull-out monitoring device of the nuclear reactor and which collects the operating state and the bypass state of the neutron detector and is easier to understand. Another object of the present invention is to provide a neutron detector status display device capable of

[0014]

In order to achieve the above-mentioned object of the present invention, according to the present invention, first, neutron detectors arranged three-dimensionally in the core of a nuclear reactor, and the neutron detector A neutron instrumentation device for converting the output signal of the reactor into a neutron output of the reactor to monitor the output state of the reactor, and a control rod control device for controlling the output of the reactor by inserting or withdrawing the control rod of the reactor. , It is possible to display a control rod pull-out prevention device for preventing the pull-out of the control rod by comparing the output of the neutron detector around the control rod with a set value, and a monitoring output for monitoring the control rod pull-out. In a reactor control rod withdrawal monitoring device comprising a neutron detector status display device, the neutron detector state display device, during control rod withdrawal monitoring,
With the graphic display of the neutron detector arranged in the selected control rod and its periphery inserted or withdrawn by the control rod control device, the function of displaying the output from the neutron detector in a color corresponding to the level A control rod pull-out monitoring device for a nuclear reactor provided is proposed.

As another means for achieving the above object of the present invention, according to the present invention, the output signals of neutron detectors which are three-dimensionally distributed in the core of a nuclear reactor, and
A neutron detector status display device for inputting position coordinate signals of selected control rods that are controlled to be inserted or extracted by the control rod control device and graphically displaying the arrangement of the control rods and the neutron detectors in the reactor. And a display device, a display control device for driving and controlling the display device, and screen selection switch means for selectively inputting a screen to be displayed on the display device. There has been proposed a neutron detector state display device having a color management table for displaying the output from the neutron detector in different colors corresponding to the output level.

Further, in order to achieve the above-mentioned other object of the present invention, in the above-mentioned neutron detector state display device, further, a neutron detector in which the operating state of the neutron detector is symbolically displayed on the display device. A status display device has been proposed.

[0017]

That is, according to the control rod pull-out monitoring device for a nuclear reactor according to the present invention, the output state of the neutron detector arranged around the selected control rod in the monitoring output during the control rod pull-out monitoring. By displaying by color,
It is possible to provide a more suitable man-machine interface by making the display easier to understand by the operator's visual sense and allowing the operator to make an accurate judgment and operation.

According to the neutron detector status display device of the present invention, the color management table of the computer
Since it is possible to display the output from the neutron detector in different colors corresponding to the output level, it is possible to display the state of the detector in a way that is easier to understand through the eyes of the operator.
Therefore, it becomes possible for an operator to provide a suitable neutron detector state display device by making an accurate judgment and operation.

Further, in the above-mentioned neutron detector state display device, the operating state of the neutron detector is further symbolically displayed on the display device so that the operating state of the neutron detector can be summarized and easily displayed. It becomes possible and very convenient for the maintenance and operation management of the neutron detector.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, FIG. 1 shows an overall configuration of a nuclear reactor monitoring and control system in a nuclear power plant.
Multiple neutron detectors 2Am, 2Bm, 2Cm, 2Dm
... are three-dimensionally distributed and installed. These plural neutron detectors 2Am, 2Bm, 2Cm, 2Dm ... are arranged at predetermined intervals in the axial and radial directions in order to monitor the local output in the nuclear reactor 1 in the axial and radial directions. By this, it is possible to detect the local output of neutrons at an arbitrary position in the reactor 1. These neutron detectors 2Am, 2Bm, 2Cm, 2D
The outputs of m ...
It is connected to 3N. That is, these neutron instrumentation devices 31 to 3N are neutron detectors 2Am, 2Bm, 2C.
m, 2Dm ... The output of each neutron detector is measured, and the average value is calculated and output as information on the reactor output. Further, when the reactor output exceeds the set value, a reactor not shown It sends a trip signal to the emergency stop system.

Further, reference numeral 8 in the drawing is a so-called control rod control device for controlling pulling out or insertion of control rods for controlling the output of the nuclear reactor 1, and reference numeral 7 is a selected control. A control rod that selects a neutron detector necessary for withdrawal monitoring corresponding to the rod, calculates the average output thereof, and outputs a control rod withdrawal prevention signal to the control rod control device 8 in comparison with a set value. It is a pull-out monitoring device.

Next, reference numeral 6 in the figure inputs various signals from the neutron instrumentation devices 31 to 3N, the control rod control device 8 and the control rod pull-out monitoring device 7, and the neutron detectors 2Am and 2B are input.
It is a so-called neutron detector state display device 6 for displaying the output states, operating states, and control rod pull-out monitoring states of m, 2Cm, 2Dm ... It should be noted that between the related devices, the optical transmission devices 40, 41 to 4N and the optical transmission line 5 are arranged in order to isolate them and to link each signal.

Further, the neutron detector status display device 6 has fixed screen information, graphic management information, color management information, etc. for status display, and a computer 61 for editing the display screen based on the input information. And a display device 63 configured by, for example, a CRT or a flat display, a display control device 62 for controlling the drive of the display device 63, and a screen selection switch 64 for selectively inputting a screen. To be done.

Here, in FIG. 2, the control rods (indicated by "+" in the figure) in the nuclear reactor 1 and the neutron detectors 2Dm to 2D are shown.
FIG. 3 shows a planar arrangement state of o (indicated by “◯” in the figure) and a three-dimensional arrangement state of these neutron detectors 2Am to 2Dp. Note that this position state is, as is clear from the figure, 16 neutron detectors 2Am to 2D.
Four p's were arranged at equal intervals in the vertical direction at four corners of a cube (broken line in the figure) formed between the control rods (in the figure,
The layers A to D are arranged in this order from the bottom).

Next, the operation of the present system described above will be described in detail with reference to the attached FIG. Note that FIG. 4 is a functional block diagram showing the software configuration of the present invention.

In the figure, first, each neutron detector 2
Outputs of Am, 2Bm, 2Cm, 2Dm ... and their operating state signals (that is, the neutron detector is operating, or
A signal indicating whether or not it is in the bypass state) is input from the neutron instrumentation devices 31 to 3N to the neutron detector state display device 6 via the optical transmission devices 41 to 4N, the optical transmission line 5, and the optical transmission device 40 ( Enter neutron detector status information: block 101 in FIG. 5). Similarly, the control rod controller 8 inputs the coordinate information of the control rods selected for controlling the power output of the reactor by performing the insertion and the withdrawal (control rod selection information input: block 102), Further, the output for control rod withdrawal monitoring and the control rod withdrawal prevention signal are input from the control rod withdrawal monitoring device 7 to the neutron detector status display device 6 (control rod withdrawal prevention information input: block 103).

Then, the signal from the neutron detector input to the neutron detector state information input (block 101) is the neutron detector output state management table (block 1).
04) and the neutron detector operating state management table (block 105).

FIG. 5 shows a neutron detector output state management table according to one embodiment of the present invention, and FIG. 6 shows a control rod state management table according to one embodiment of the present invention. That is, as shown in FIG. 5, in this neutron detector output state management table, the neutron detector output state of the neutron detector is output together with the number uniquely assigned corresponding to the plane coordinates and the vertical position of each neutron detector. The item stores the latest output data (for example, displayed in%). Further, as shown in FIG. 6, in the neutron detector operation state management table, each neutron detector is in operation or not in operation, together with a number uniquely assigned corresponding to the plane coordinates and the vertical position of each neutron detector. Operating status data (“0” or “1”)
Signal), and bypass state data (signal “0” or “1”) as a state in which the neutron detector is separated from the signal processing. It should be noted that the signal "1" in the operating state section indicates that the neutron detector is operating, while the signal "0" indicates that it is not operating. In the bypass state section, the signal "1" indicates that the neutron detector is in bypass, and "0" indicates that it is not bypassed.

In FIG. 4, the output signal from the control rod selection information input (block 102) is sent to the control rod selection information management table (block 106) and the output signal from the control rod withdrawal prevention information input (block 103). Is input to the control rod pull-out prevention information management table (block 107). An example of the control rod selection information management table and the control rod pull-out prevention information management table is shown in FIGS.
Shown in.

That is, in the control rod selection information management table, the control rod selection information ("0") indicating the selected state is given together with the number uniquely assigned to the coordinate of each control rod.
Alternatively, data "1") is stored. In addition, in the control rod pull-out prevention information management table, together with the number uniquely assigned to the coordinates of each control rod,
Data indicating the control rod withdrawal prevention state (“0” or “1”
Signal) is stored. In the selection states of these tables, the signal "1" is selected, on the other hand, the signal "0" is not selected, and in the extraction prevention state, the signal "1" is selected. "Indicates that the pull-out prevention is in progress, while the signal" 0 "indicates that the pull-out prevention state is released.

Subsequently, the control rod selection information from the control rod selection information management table (block 106) and the control rod withdrawal prevention information from the control rod withdrawal prevention information management table (block 107) are the graphic management table. It is output to (block 108) where the graphic pattern according to the variable state is selected. For example,
The display screen of the control rod selection state and the control rod pull-out prevention state is registered with the graphic pattern shown in FIG. 9, and the display screen of the neutron detector state display is registered with the graphic pattern shown in FIG.

On the other hand, the neutron detector output state information from the neutron detector output state management table (block 104) and the neutron detector operating state information from the neutron detector operation state management table (block 105) are: Input to the color management table (block 109).

An example of this color management table is shown in FIG. In the color management table shown in this figure, the control in which the gradation of the color is juxtaposed on the output scale of the neutron detector for monitoring the control rod withdrawal including the engineering units shown in the display screens of FIGS. The color is set at 1% intervals so that the display of the output for monitoring the rod pull-out corresponds. The color codes A to N and the color auxiliary codes a to i in the figure may be set in different colors, and the color auxiliary codes a to i are the color codes A to i.
It is also possible to set by the shade of ~ N.

Returning to FIG. 4 again, the output signal from the display screen selection information input (block 110) by the screen selection switch 64 of the neutron detector status display device 6, and further the control rod selection information input (block 102). Depending on the output signal, from the plurality of display screens described above, that is, the display screen of the control rod selection state and the control rod pull-out prevention state shown in FIG. 9, or the display screen of the neutron detector state display shown in FIG. The required fixed screen information of the display screen is selected (block 111). The output signal from the fixed screen information (block 111) is further edited with the selected output signal from the graphic management table (block 108) and the color management table (block 109) to edit the display screen (block 112). ), And is output to the display controller 62 (see FIG. 1) as a display screen output (block 113). That is, the fixed screen information and the data selected in the graphic management table and the color management table are edited as a display screen and output to the display device.

By the operation described in detail above, the display screen displayed on the display device 63 of the neutron detector state display device 6 is arranged in the core as illustrated in FIGS. 9 and 10 above. The output of the neutron detector will be displayed in color. Specifically, in the example of the display screen shown in FIG. 9, the "control rod map" and the control rod pull-out monitoring output for each control rod pull-out monitoring area (from area 1 to area n) are displayed. Further, "output color for control rod pull-out monitoring-corresponding to output" in the display screen indicates the relationship between the neutron detector output and the color set in the color management table shown in FIG. In, in each monitoring area, the coordinates of the selected control rod and the control rod pull-out monitoring output around it are further displayed by a graphic pattern and a color. Further, in the control rod map display area, a graphic management table (see FIG.
(See block 108 of FIG. 3), the “selection control rod” and “control rod pullout prevention” states are indicated by symbols in the display screen, so that the operator can easily know the output for control rod pullout monitoring. Is displayed.

In the neutron detector status display screen shown in FIG. 10, "control rod / neutron detector map", "neutron detector status", and "neutron detector output" are displayed. This display example shows an example in which the output state of the neutron detector on a certain plane is graphically displayed with respect to the vertical position of the neutron detector composed of the layers A, B, C, and D shown in FIG. However, not limited to this, for example, it is possible to display symbols of neutron detectors side by side on four planes, or to stereoscopically display a plurality of neutron detectors arranged in the core three-dimensionally. , As would be readily apparent to one skilled in the art. In addition, here, the symbol of each of these neutron detectors (“control rod / neutron detector map” in the figure)
The color corresponding to the output by the setting of the color management table of FIG. 11 is displayed for the symbol “◯” in the area. Further, in this embodiment, the state of the neutron detector is displayed according to the setting of the graphic management table. That is, the open circle symbol indicates that it is in operation, the double circle symbol with the center filled in black indicates that it is in bypass, and the solid circle symbol indicates that the neutron detector is inactive. Shows.

Next, FIGS. 12 and 13 show another embodiment of the present invention. That is, in the display screen of FIG. 12 which is another embodiment, the auxiliary numbers from 1 to 9 set in the color management table of FIG. 11 are displayed in the circular symbol of the neutron detector. It is displayed corresponding to the output level. That is, in the case of this other embodiment, in the display screen of FIG. 10 described above, the output scale of the neutron detector for monitoring the control rod pull-out including the engineering unit is a control rod in which color gradations are juxtaposed. It is basically 1 except the upper and lower limits so as to correspond to the pull-out monitoring output display.
The color is set at 0% intervals, and the auxiliary numeral is set corresponding to the output from 0 to 9 at 1% intervals.

Further, in the above embodiment, the neutron instrumentation devices 31 to 3n of FIG. 1 particularly correspond to the neutron flux level to be measured or the reactor output, and the neutron source region monitor, the intermediate region monitor and the output region monitor. Alternatively, the neutron detector is divided into a start-up area monitor and an output area monitor, and different types of neutron detectors are used according to their applications. Furthermore, in the embodiment described above, the output region monitor is assumed, but it is equivalent in measuring the output of the neutron detector that is three-dimensionally arranged in the reactor, and other regions are measured. Those skilled in the art can easily think that the present invention can be similarly applied to such monitors.

[0039]

As is clear from the above detailed description, according to the reactor control rod pull-out monitoring device and the neutron detector state display device of the present invention, the output state of the neutron detector,
The operating conditions and the layout of control rods and neutron detectors in the reactor, the output information for control rod pull-out monitoring in the peripheral area of multiple selected control rods, and the control rod pull-out monitoring state can be instantly and easily understood. Therefore, the plant operator is urged to make an accurate judgment and operation, which has an excellent effect that it is possible to maintain highly reliable operation.

Further, according to the neutron detector status display device of the present invention, there is an excellent effect that the maintenance management of the neutron detector and the operation management of the nuclear reactor become easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a control rod pull-out monitoring device for a nuclear reactor equipped with a neutron detector status display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a planar arrangement of control rods and neutron detectors in a reactor to which the control rod pull-out monitoring device for a nuclear reactor is applied.

FIG. 3 is a diagram showing a three-dimensional arrangement of neutron detectors in a nuclear reactor to which the control rod pull-out monitoring device for the nuclear reactor is applied.

FIG. 4 is a functional block diagram for explaining a software configuration of the control rod pull-out monitoring device of the reactor.

FIG. 5 is a diagram showing an example of a neutron detector output state management table in the software configuration.

FIG. 6 is a diagram showing an example of a neutron detector operation state management table in the software configuration.

FIG. 7 is a diagram showing an example of a control rod selection information management table in the software configuration.

FIG. 8 is a diagram showing an example of a control rod pull-out prevention information management table in the software configuration.

FIG. 9 is a diagram showing an example of a display screen of a neutron detector state display device in the control rod pull-out monitoring device of the reactor.

FIG. 10 is a diagram showing an example of a display screen of a neutron detector state display device in the control rod pull-out monitoring device of the nuclear reactor.

FIG. 11 is a diagram showing an example of a color management table in the neutron detector state display device.

FIG. 12 is a diagram showing an example of a display screen of a neutron detector status display device according to another embodiment of the present invention.

FIG. 13 is a diagram showing a color management table of the other embodiment.

FIG. 14 is a diagram showing an example of an output display for monitoring the control rod withdrawal in the conventional monitoring control system.

[Explanation of symbols]

 1 Reactor 1Bm, 2Bm, 2Cm, 2Dm Neutron Detector 31-3N Neutron Instrumentation Device 40, 41-4N Optical Transmission Device 5 Optical Transmission Line 6 Neutron Detector State Display Device 61 Computer 62 Display Control Device 63 Indicator 64 Screen Selection switch 7 Control rod pull-out monitoring device 8 Control rod control device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shoji Kumami 5-2-1 Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Omika Plant, Hitachi Ltd. (72) Inventor Akira Nishida 5-chome, Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Incorporated company Hitachi Ltd. Omika Plant (72) Inventor Shoichi Matsumiya 52-1 Omika-cho, Hitachi City, Ibaraki Prefecture Incorporated company Hitachi Ltd. Omika Plant (72) Inventor Gonichiro Furusato Hitachi Ibaraki Prefecture 2-5-1, Omika-cho, Oita-shi Incorporated company Hitachi, Ltd. Omika factory

Claims (16)

[Claims] 1. A neutron detector which is three-dimensionally distributed in the core of a nuclear reactor, and a neutron meter for converting the output signal of the neutron detector into the neutron output of the nuclear reactor to monitor the output state of the nuclear reactor. Equipment, the control rod control device to control the output of the reactor by inserting or withdrawing the control rod of the reactor, the output of the neutron detector around the control rod of the control rod in comparison with the set value. A control rod withdrawal prevention device to prevent withdrawal,
In a reactor control rod withdrawal monitoring device comprising a neutron detector status display device capable of displaying a monitoring output for control rod withdrawal monitoring, the neutron detector status display device, during control rod withdrawal monitoring , A function of graphically displaying a selected control rod inserted or withdrawn by the control rod control device and a neutron detector arranged around the control rod, and displaying the output from the neutron detector in a color corresponding to the level A control rod pull-out monitoring device for a nuclear reactor, comprising: 2. The nuclear reactor control rod withdrawal monitoring device according to claim 1, wherein the neutron detector status display device further displays the output from the neutron detector in a gradation of a color corresponding to the level. A control rod pull-out monitoring device for a reactor characterized by having functions. 3. The control rod pull-out monitoring device for a nuclear reactor according to claim 1, wherein the neutron detector status display device further displays an output from the neutron detector by an auxiliary numeral corresponding to its level. A control rod pull-out monitoring device for a nuclear reactor, which is equipped with a function for 4. The control rod withdrawal monitoring device for a nuclear reactor according to claim 1, wherein the neutron detector status display device controls the control rod withdrawal for each control rod withdrawal monitoring region based on the output from the neutron detector. Control of the nuclear reactor, which is equipped with a function to display the output for use in a graphic manner and to display the output level of each monitoring area based on the output from those neutron detectors in the color corresponding to the level. Bar pullout monitoring device. 5. The nuclear reactor control rod withdrawal monitoring device according to claim 1, wherein the neutron detector status display device displays the displayed color and the output level of the neutron detector on a part of its display screen. A control rod pull-out monitoring device for a reactor, which graphically displays the correspondence. 6. The reactor control rod pull-out monitoring device according to claim 1, wherein the neutron detector status display device further comprises a planar arrangement of the selected control rod and neutron detectors arranged around the selected control rod. Control rod / neutron detector map showing that the output of the neutron detector displayed on the map is also displayed in color Monitoring equipment. 7. The reactor control rod pull-out monitoring device according to claim 6, wherein the neutron detector state display device further comprises an operating state of the neutron detector displayed on the control rod / neutron detector map. A control rod pull-out monitoring device for a nuclear reactor, which has a function of displaying. 8. The reactor control rod pull-out monitoring device according to claim 7, wherein the neutron detector state display device indicates the operating state of the neutron detector displayed on the control rod / neutron detector map. A control rod pull-out monitoring device for a nuclear reactor having a display function. 9. The reactor control rod pull-out monitoring device according to claim 6, wherein the neutron detector status display device has a function of planarly displaying the control rod / neutron detector map. A control rod pull-out monitoring device for a nuclear reactor. 10. The control rod pull-out monitoring device for a nuclear reactor according to claim 6, wherein the neutron detector status display device has a function of stereoscopically displaying the control rod / neutron detector map. A control rod pull-out monitoring device for a nuclear reactor. 11. An input signal of neutron detectors, which are three-dimensionally distributed in the core of a nuclear reactor, and position coordinate signals of selected control rods which are controlled to be inserted or extracted by a control rod control device are input. A neutron detector state display device for graphically displaying the arrangement of the control rod and the neutron detector in a nuclear reactor, a computer, a display device, and a display control device for driving and controlling the display device, With a screen selection switch means for selectively inputting a screen to be displayed on the display device, the computer, the output from the input neutron detector, for displaying in different colors corresponding to the output level A neutron detector status display device comprising a color management table. 12. The neutron detector status display device according to claim 11, wherein the computer further registers a graphic pattern for graphically displaying an arrangement of the control rod and the neutron detector in a nuclear reactor. A neutron detector status display device comprising a management table. 13. The neutron detector status display device according to claim 11, wherein the color management table of the computer further displays the output from the neutron detector in a gradation of a color corresponding to the output level. A neutron detector status display device, characterized in that it is provided with a color complementary color code. 14. The neutron detector status display device according to claim 11, wherein the color management table of the computer further displays an output from the neutron detector by an auxiliary numeral corresponding to the output level. A neutron detector status display device characterized by being provided with an auxiliary numeral code. 15. The neutron detector status display device according to claim 11, wherein the color management table is displayed on the display device. 16. The neutron detector state display device according to claim 11, wherein the displayed operation state of the neutron detector is symbolically displayed on the display device. .